You must have a sixth sense in fish measuring ability to so accurately formulate the length of a fish without even bringing it to hand...

Unfortunately, in my experience they are often not as big as I thought once I get out the tape measure...

Kidding aside... I have no doubt that there are a few bigger browns lurking in some of those MP holes. For me personally, I fish the park just for the experience of being in the park and if I tag a big one, great! I have no problem at all catching a mess of 10" fish and find it just as fun. When I head to the mountains, I'm not really thinking 'big fish' or I would have just hit one of the tailwaters instead...